Viewing file:  rsirq.c (14.86 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/*******************************************************************************
*
* Module Name: rsirq - IRQ resource descriptors
* $Revision: 18 $
*
******************************************************************************/
/*
* Copyright (C) 2000, 2001 R. Byron Moore
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "acpi.h"
#include "acresrc.h"
#define _COMPONENT ACPI_RESOURCES
MODULE_NAME ("rsirq")
/*******************************************************************************
*
* FUNCTION: Acpi_rs_irq_resource
*
* PARAMETERS: Byte_stream_buffer - Pointer to the resource input byte
* stream
* Bytes_consumed - u32 pointer that is filled with
* the number of bytes consumed from
* the Byte_stream_buffer
* Output_buffer - Pointer to the user's return buffer
* Structure_size - u32 pointer that is filled with
* the number of bytes in the filled
* in structure
*
* RETURN: Status
*
* DESCRIPTION: Take the resource byte stream and fill out the appropriate
* structure pointed to by the Output_buffer. Return the
* number of bytes consumed from the byte stream.
*
******************************************************************************/
acpi_status
acpi_rs_irq_resource (
u8 *byte_stream_buffer,
u32 *bytes_consumed,
u8 **output_buffer,
u32 *structure_size)
{
u8 *buffer = byte_stream_buffer;
acpi_resource *output_struct = (acpi_resource *) *output_buffer;
u16 temp16 = 0;
u8 temp8 = 0;
u8 index;
u8 i;
u32 struct_size = SIZEOF_RESOURCE (acpi_resource_irq);
FUNCTION_TRACE ("Rs_irq_resource");
/*
* The number of bytes consumed are contained in the descriptor
* (Bits:0-1)
*/
temp8 = *buffer;
*bytes_consumed = (temp8 & 0x03) + 1;
output_struct->id = ACPI_RSTYPE_IRQ;
/*
* Point to the 16-bits of Bytes 1 and 2
*/
buffer += 1;
MOVE_UNALIGNED16_TO_16 (&temp16, buffer);
output_struct->data.irq.number_of_interrupts = 0;
/* Decode the IRQ bits */
for (i = 0, index = 0; index < 16; index++) {
if((temp16 >> index) & 0x01) {
output_struct->data.irq.interrupts[i] = index;
i++;
}
}
output_struct->data.irq.number_of_interrupts = i;
/*
* Calculate the structure size based upon the number of interrupts
*/
struct_size += (output_struct->data.irq.number_of_interrupts - 1) * 4;
/*
* Point to Byte 3 if it is used
*/
if (4 == *bytes_consumed) {
buffer += 2;
temp8 = *buffer;
/*
* Check for HE, LL or HL
*/
if (temp8 & 0x01) {
output_struct->data.irq.edge_level = EDGE_SENSITIVE;
output_struct->data.irq.active_high_low = ACTIVE_HIGH;
}
else {
if (temp8 & 0x8) {
output_struct->data.irq.edge_level = LEVEL_SENSITIVE;
output_struct->data.irq.active_high_low = ACTIVE_LOW;
}
else {
/*
* Only _LL and _HE polarity/trigger interrupts
* are allowed (ACPI spec v1.0b ection 6.4.2.1),
* so an error will occur if we reach this point
*/
return_ACPI_STATUS (AE_BAD_DATA);
}
}
/*
* Check for sharable
*/
output_struct->data.irq.shared_exclusive = (temp8 >> 3) & 0x01;
}
else {
/*
* Assume Edge Sensitive, Active High, Non-Sharable
* per ACPI Specification
*/
output_struct->data.irq.edge_level = EDGE_SENSITIVE;
output_struct->data.irq.active_high_low = ACTIVE_HIGH;
output_struct->data.irq.shared_exclusive = EXCLUSIVE;
}
/*
* Set the Length parameter
*/
output_struct->length = struct_size;
/*
* Return the final size of the structure
*/
*structure_size = struct_size;
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: Acpi_rs_irq_stream
*
* PARAMETERS: Linked_list - Pointer to the resource linked list
* Output_buffer - Pointer to the user's return buffer
* Bytes_consumed - u32 pointer that is filled with
* the number of bytes of the
* Output_buffer used
*
* RETURN: Status
*
* DESCRIPTION: Take the linked list resource structure and fills in the
* the appropriate bytes in a byte stream
*
******************************************************************************/
acpi_status
acpi_rs_irq_stream (
acpi_resource *linked_list,
u8 **output_buffer,
u32 *bytes_consumed)
{
u8 *buffer = *output_buffer;
u16 temp16 = 0;
u8 temp8 = 0;
u8 index;
u8 IRQinfo_byte_needed;
FUNCTION_TRACE ("Rs_irq_stream");
/*
* The descriptor field is set based upon whether a third byte is
* needed to contain the IRQ Information.
*/
if (EDGE_SENSITIVE == linked_list->data.irq.edge_level &&
ACTIVE_HIGH == linked_list->data.irq.active_high_low &&
EXCLUSIVE == linked_list->data.irq.shared_exclusive) {
*buffer = 0x22;
IRQinfo_byte_needed = FALSE;
}
else {
*buffer = 0x23;
IRQinfo_byte_needed = TRUE;
}
buffer += 1;
temp16 = 0;
/*
* Loop through all of the interrupts and set the mask bits
*/
for(index = 0;
index < linked_list->data.irq.number_of_interrupts;
index++) {
temp8 = (u8) linked_list->data.irq.interrupts[index];
temp16 |= 0x1 << temp8;
}
MOVE_UNALIGNED16_TO_16 (buffer, &temp16);
buffer += 2;
/*
* Set the IRQ Info byte if needed.
*/
if (IRQinfo_byte_needed) {
temp8 = 0;
temp8 = (u8) ((linked_list->data.irq.shared_exclusive &
0x01) << 4);
if (LEVEL_SENSITIVE == linked_list->data.irq.edge_level &&
ACTIVE_LOW == linked_list->data.irq.active_high_low) {
temp8 |= 0x08;
}
else {
temp8 |= 0x01;
}
*buffer = temp8;
buffer += 1;
}
/*
* Return the number of bytes consumed in this operation
*/
*bytes_consumed = POINTER_DIFF (buffer, *output_buffer);
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: Acpi_rs_extended_irq_resource
*
* PARAMETERS: Byte_stream_buffer - Pointer to the resource input byte
* stream
* Bytes_consumed - u32 pointer that is filled with
* the number of bytes consumed from
* the Byte_stream_buffer
* Output_buffer - Pointer to the user's return buffer
* Structure_size - u32 pointer that is filled with
* the number of bytes in the filled
* in structure
*
* RETURN: Status
*
* DESCRIPTION: Take the resource byte stream and fill out the appropriate
* structure pointed to by the Output_buffer. Return the
* number of bytes consumed from the byte stream.
*
******************************************************************************/
acpi_status
acpi_rs_extended_irq_resource (
u8 *byte_stream_buffer,
u32 *bytes_consumed,
u8 **output_buffer,
u32 *structure_size)
{
u8 *buffer = byte_stream_buffer;
acpi_resource *output_struct = (acpi_resource *) *output_buffer;
u16 temp16 = 0;
u8 temp8 = 0;
NATIVE_CHAR *temp_ptr;
u8 index;
u32 struct_size = SIZEOF_RESOURCE (acpi_resource_ext_irq);
FUNCTION_TRACE ("Rs_extended_irq_resource");
/*
* Point past the Descriptor to get the number of bytes consumed
*/
buffer += 1;
MOVE_UNALIGNED16_TO_16 (&temp16, buffer);
*bytes_consumed = temp16 + 3;
output_struct->id = ACPI_RSTYPE_EXT_IRQ;
/*
* Point to the Byte3
*/
buffer += 2;
temp8 = *buffer;
output_struct->data.extended_irq.producer_consumer = temp8 & 0x01;
/*
* Check for HE, LL or HL
*/
if(temp8 & 0x02) {
output_struct->data.extended_irq.edge_level = EDGE_SENSITIVE;
output_struct->data.extended_irq.active_high_low = ACTIVE_HIGH;
}
else {
if(temp8 & 0x4) {
output_struct->data.extended_irq.edge_level = LEVEL_SENSITIVE;
output_struct->data.extended_irq.active_high_low = ACTIVE_LOW;
}
else {
/*
* Only _LL and _HE polarity/trigger interrupts
* are allowed (ACPI spec v1.0b ection 6.4.2.1),
* so an error will occur if we reach this point
*/
return_ACPI_STATUS (AE_BAD_DATA);
}
}
/*
* Check for sharable
*/
output_struct->data.extended_irq.shared_exclusive = (temp8 >> 3) & 0x01;
/*
* Point to Byte4 (IRQ Table length)
*/
buffer += 1;
temp8 = *buffer;
output_struct->data.extended_irq.number_of_interrupts = temp8;
/*
* Add any additional structure size to properly calculate
* the next pointer at the end of this function
*/
struct_size += (temp8 - 1) * 4;
/*
* Point to Byte5 (First IRQ Number)
*/
buffer += 1;
/*
* Cycle through every IRQ in the table
*/
for (index = 0; index < temp8; index++) {
output_struct->data.extended_irq.interrupts[index] =
(u32)*buffer;
/* Point to the next IRQ */
buffer += 4;
}
/*
* This will leave us pointing to the Resource Source Index
* If it is present, then save it off and calculate the
* pointer to where the null terminated string goes:
* Each Interrupt takes 32-bits + the 5 bytes of the
* stream that are default.
*/
if (*bytes_consumed >
(u32)(output_struct->data.extended_irq.number_of_interrupts * 4) + 5) {
/* Dereference the Index */
temp8 = *buffer;
output_struct->data.extended_irq.resource_source.index = (u32) temp8;
/* Point to the String */
buffer += 1;
/*
* Point the String pointer to the end of this structure.
*/
output_struct->data.extended_irq.resource_source.string_ptr =
(NATIVE_CHAR *)(output_struct + struct_size);
temp_ptr = output_struct->data.extended_irq.resource_source.string_ptr;
/* Copy the string into the buffer */
index = 0;
while (0x00 != *buffer) {
*temp_ptr = *buffer;
temp_ptr += 1;
buffer += 1;
index += 1;
}
/*
* Add the terminating null
*/
*temp_ptr = 0x00;
output_struct->data.extended_irq.resource_source.string_length = index + 1;
/*
* In order for the Struct_size to fall on a 32-bit boundary,
* calculate the length of the string and expand the
* Struct_size to the next 32-bit boundary.
*/
temp8 = (u8) (index + 1);
struct_size += ROUND_UP_TO_32_bITS (temp8);
}
else {
output_struct->data.extended_irq.resource_source.index = 0x00;
output_struct->data.extended_irq.resource_source.string_length = 0;
output_struct->data.extended_irq.resource_source.string_ptr = NULL;
}
/*
* Set the Length parameter
*/
output_struct->length = struct_size;
/*
* Return the final size of the structure
*/
*structure_size = struct_size;
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: Acpi_rs_extended_irq_stream
*
* PARAMETERS: Linked_list - Pointer to the resource linked list
* Output_buffer - Pointer to the user's return buffer
* Bytes_consumed - u32 pointer that is filled with
* the number of bytes of the
* Output_buffer used
*
* RETURN: Status
*
* DESCRIPTION: Take the linked list resource structure and fills in the
* the appropriate bytes in a byte stream
*
******************************************************************************/
acpi_status
acpi_rs_extended_irq_stream (
acpi_resource *linked_list,
u8 **output_buffer,
u32 *bytes_consumed)
{
u8 *buffer = *output_buffer;
u16 *length_field;
u8 temp8 = 0;
u8 index;
NATIVE_CHAR *temp_pointer = NULL;
FUNCTION_TRACE ("Rs_extended_irq_stream");
/*
* The descriptor field is static
*/
*buffer = 0x89;
buffer += 1;
/*
* Set a pointer to the Length field - to be filled in later
*/
length_field = (u16 *)buffer;
buffer += 2;
/*
* Set the Interrupt vector flags
*/
temp8 = (u8)(linked_list->data.extended_irq.producer_consumer & 0x01);
temp8 |= ((linked_list->data.extended_irq.shared_exclusive & 0x01) << 3);
if (LEVEL_SENSITIVE == linked_list->data.extended_irq.edge_level &&
ACTIVE_LOW == linked_list->data.extended_irq.active_high_low) {
temp8 |= 0x04;
}
else {
temp8 |= 0x02;
}
*buffer = temp8;
buffer += 1;
/*
* Set the Interrupt table length
*/
temp8 = (u8) linked_list->data.extended_irq.number_of_interrupts;
*buffer = temp8;
buffer += 1;
for (index = 0; index < linked_list->data.extended_irq.number_of_interrupts;
index++) {
MOVE_UNALIGNED32_TO_32 (buffer,
&linked_list->data.extended_irq.interrupts[index]);
buffer += 4;
}
/*
* Resource Source Index and Resource Source are optional
*/
if (0 != linked_list->data.extended_irq.resource_source.string_length) {
*buffer = (u8) linked_list->data.extended_irq.resource_source.index;
buffer += 1;
temp_pointer = (NATIVE_CHAR *) buffer;
/*
* Copy the string
*/
STRCPY (temp_pointer,
linked_list->data.extended_irq.resource_source.string_ptr);
/*
* Buffer needs to be set to the length of the sting + one for the
* terminating null
*/
buffer += (STRLEN (linked_list->data.extended_irq.resource_source.string_ptr) + 1);
}
/*
* Return the number of bytes consumed in this operation
*/
*bytes_consumed = POINTER_DIFF (buffer, *output_buffer);
/*
* Set the length field to the number of bytes consumed
* minus the header size (3 bytes)
*/
*length_field = (u16) (*bytes_consumed - 3);
return_ACPI_STATUS (AE_OK);
}
|